1.

The frequency of vibration of a turningfork is 480 Hz and the velocity of awaves in air is 320 m/s. How far havethe sound waves reached when thetuning fork has completed 120vibrations?

Answer»

the frequency of tuning fork is 480Hz

so, in 1 sec it vibrates 480 times

in 120 vibrations the time taken will be 120/480 = 1/4sec

now, distance is = velocity*time = 320*(1/4) = 80m



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